Drive force control device for vehicle
a technology for controlling devices and driving forces, applied in gearing control, gearing elements, belts/chains/gearrings, etc., can solve problems such as the final vehicle drive force deviating from the target drive force, and achieve the effect of enhancing the response and acceleration performance of the vehicle and achieving a greater speed ratio
Active Publication Date: 2016-02-16
NISSAN MOTOR CO LTD
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The solution enables precise control of vehicle drive force, enhancing acceleration performance and maintaining target drive force characteristics, even in sport modes, by adjusting the target input torque and rotation speed within the automatic transmission.
Problems solved by technology
However, in the PTD control, simply switching the shift map may result in a final vehicle drive force deviated from a target drive force.
Method used
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[0038]Referring to FIG. 1 of the drawings, an output of an internal combustion engine 1 of a vehicle is input into a continuously variable transmission (CVT) 12 via a torque converter 11. The continuously variable transmission comprises a primary pulley 13, a secondary pulley 14 and a V-belt 15 mounted on these pulleys. The primary pulley 13 changes a contact radius with the V-belt 15 by changing a groove width according to a hydraulic pressure Ppri. The secondary pulley 14 changes a contact radius with the V-belt 15 by changing a groove width according to a hydraulic pressure Psec. As a result, the CVT 12 continuously changes a ratio of an input rotation speed and an output rotation speed, i.e. a speed ratio according to controls of the hydraulic pressures Ppri and Psec. The hydraulic pressures Ppri and Psec are generated by a hydraulic pressure supply device 16.
[0039]The secondary pulley 14 is coupled to drive wheels via a final gear 18 and a differential 19.
[0040]The internal com...
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A target drive force is computed according to an accelerator pedal opening. A target input rotation speed lower limit basic value to an automatic transmission is computed based on a vehicle speed and a shift range of the automatic transmission. A target drive force lower limit correction value is computed based on the target input rotation speed lower limit basic value. The target drive force is corrected based on the target drive force lower limit correction value. A target input torque of the automatic transmission is computed based on the target drive force after correction. An input torque to the automatic transmission is controlled to the target input torque. By this control, an arbitrary drive force characteristic can be obtained in a PTD control.
Description
TECHNICAL FIELD[0001]The prevent invention relates to an improvement of a powertrain torque demand control for integrally controlling a speed ratio and the operation of an internal combustion engine based on a target vehicle drive force.BACKGROUND ART[0002]For a drive force control for vehicle, an method has been conventionally widely adopted which controls an output of an internal combustion engine based on a depression amount of an accelerator pedal and, on the other hand, controls a speed ratio of an automatic transmission based on the depression amount of the accelerator pedal and a vehicle speed. According to this conventional method, the engine and the transmission are independently controlled according to individual target values.[0003]In contrast, JP2001-328462A, published in 2001 by the Japan Patent Office, proposes a powertrain torque demand (PTD) control for setting a target vehicle drive force from a depression amount of an accelerator pedal and a vehicle speed and integ...
Claims
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IPC IPC(8): B60W10/10B60W10/06B60W30/188F02D11/10F02D29/02F16H61/02F16H63/50B60W10/107B60W10/04B60W10/101B60W10/108F02D29/00B60W50/08F16H59/18
CPCB60W30/188B60W10/04B60W10/06B60W10/101B60W10/107B60W10/108B60W30/1882B60W50/082F02D11/106F02D29/00F02D29/02F16H61/02F16H61/0213F16H63/50B60W2510/0604B60W2710/105B60W2710/1022F02D2200/0404F02D2200/501F02D2200/602F16H59/18
Inventor YOSHINO, TAKAHIROIRIYAMA, MASAHIRO
Owner NISSAN MOTOR CO LTD